I think this page actually describes the Direct Route, though it's difficult to tell from the content. The name Milestone Buttress should refer to the whole Buttress. I've done the Original Route and the Rowan Route. One on a rainy day and the other really early in the morning - so no queuing!
A grand day out with Colin & Ken doing the Direct route which is the classic route on the Milestone and following up with Pulpit route (diff) shorter and easier than Direct route. But both routes provide fine entertainment.( see the bumper fun book - Climbers Club guide to Ogwen & Carneddau)
Very polished! 2 teams of 2 went up early saturday morning on the Direct Route (Vdiff), and had the route to ourselves, but considering the heavy rain the night before not a massive suprise. One leader had a small epic on the first pitch with huge rope drag, but all was well.